First off, consider what you have and where you would like to go. If you want more bass, go with a cable that has conductor of larger diameter than what you have and if you want more highs go with a cable that has a conductor of smaller diameter. As for details and speed, to get more you need a cable with a lighter dielectric, look for some dielectric that introduce air around the conductors. As a DIY cables enthusiast and micro manufacturer, I make IC cables with 20, 22 and 24 AWG OCC copper, each rendering a slightly different tonal image with the 20 awg having more bass and the 24 towards the leaner side. For the dielectric, to have a sound as fast as it can be, I use layers of braided natural fibers to enclose and assembles the conductors.
